I'd have no problem going to all First class, There are some, maybe even most that don't get the magazine just for the want adds, but for the stories and pictures of past events. Just for comparison I joined ATHS while at the winter convention and the dues there are $42 per year. I think HCEA dues are around $30 per year.
Now as Paul Harvey says I'll tell you a little more than I know, which isn't much. I'm just a Rural Carrier in a one horse office out in fly over country. Somewhere in one of GWH's post he said periodicals get priority treatment. I hope you aren't confusing the two. Periodicals are not priority nor are they first class. It used to be and I think still is the case that the more preparation that is done by the mailer, the less the cost, and the more direct the service is. Periodicals work well when you have large concentrations of pieces going to each Post Office. I may not be exact on this , but close. If you have at least 24 pieces going to an office, you can bundle them and sack them to go directly to that office. If not and you have at least 24 going to a 3 digit area. (my zip code is 66962, the 3 digit area I refer to is 669) they can be sent to more of a regional processing center to be distributed from there. These are the fastest ways to make periodicals work. If the concentration is less than that, they would go to the bigger processing plants and be distributed to the regional plants then to the local offices. which means more delays. There are, as GWH stated, quite a bunch of rules and regulations controlling periodical mailings. There are companies that can bundle magazines from several different companies or organizations together to get the concentration high enough to ship directly to each office. Also the major publications like Time, Newsweek, USA Today and the like will drop ship theirs right to the regional processing centers to have them delivered the next day. They don't just magically appear in mail boxes across the country on the same day without a lot of preparation and planning. Maybe the answer is to go out and sign up all of your friends and neighbors to be members in ACMOC.
I guess what I am trying to say, however poorly, is I hope you aren't thinking that simply switching to periodical class mail is the be all-end all and everyone will get their magazine on the same day from coast to coast. That isn't going to happen even if they are sent all first class.
I don't know who you are using to publish the magazine or if it is self published and printed. Peoria is a big enough city that it should have customer service representatives there, and there are people whose job is to help with these types of mailings. My suggestion is take a magazine and your mailing list to the main Post Office and ask to speak to the Postmaster or customer service rep and get their advice and have them explain the options and pluses or minuses of each type of service. It may be best to call and make an appointment. If you don't get help, ask to speak to their supervisor. Contrary to popular belief they are there to help you. The Post Office is filled with a lot of good people. The problem is it only takes one bad apple along the way to really fowl things up. But that is true with a lot of things, whether it be the court system, or contractors, mechanics, repair people or anyone we have to deal with in life. There has only been One Perfect Man in all of history and He died and rose again to save the rest of us.
Jim